27. There are many children and adolescents ______ behavior is generally unacceptable.
A. who
B. whom
C. whose
D. that
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28. ____ the Atlantic Ocean crosses the equator, the trade winds cause a flow of water to the west.
And
B. Where
C. At
D. That
29. I'd rather you _____ anything about it for the time being.
A. didn't do
B. not do
C. not to do
D. don't have to
30. It is not always possible to foresee the obstacles _____ your way towards an ambitious goal.
A. blocked
B. blocking
C. to block
D. to blocking
Section BDirections: There are 10 incomplete statements here. You should fill in each blank with the proper form of the word given in the brackets.31. It is (sure) _____ self-evident that radical changes must be made before any real progress can be achieved.